Might as well throw in Product Mentions (http://www.productmentions.com). Scraping reddit to figure out which Amazon links are mentioned, and displaying them on the site. I was going to add affiliate links, but didn't seem really correct. Still have the possibility of companies getting in contact about looking for mentions of their brands to make sure users aren't complaining. Obviously I'm sure there are other companies who do this, but always could be an option that I already have the code for.

And also planning on throwing in HN Amazon link mentions using the API. Even if making no money, always fun to see what people are talking about on sites like Reddit.